Memory management method for preventing an operating system...

Details Memory management method for preventing an operating system... Memory management method for preventing an operating system...

2005-05-03

2005-05-03

Nguyen, T (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S205000, C711S206000, C711S207000, C711S209000, C711S155000

Reexamination Certificate

active

06889296

ABSTRACT:
Disclosed is a method of managing memory to prevent an operating system from writing into user memory space, the method comprising providing a translation look-aside buffer (TLB) for storing TLB entries, each said TLB entry comprising a virtual address of a page in system memory space, a real address of said page, a flag entry for storing a value F indicating whether said page is a user page in said user memory space, providing a space recovery mode register comprising a mode entry for storing a value E indicating whether the system is in a normal mode or in a space recovery mode, said value of E set to said space recovery mode when available free user space fall below a predetermined threshold value, and for each said TLB entry, designating said page in system memory space as read-only when F=0 and E=0. An alternative embodiment is also disclosed wherein no modifications to memory structures are required.

REFERENCES:
patent: 4849881 (1989-07-01), Eguchi
patent: 6092172 (2000-07-01), Nishimoto et al.
patent: 6301647 (2001-10-01), Green
patent: 6351797 (2002-02-01), Beard et al.
patent: 6532528 (2003-03-01), Nishimoto et al.

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